FIRECLUB 2017 Universal Tactical Pistol Scope Sight Polymer Light Weight Mount with 7/8" Weaver & Picatinny Glock 17 5.56 for s&w/1911/Glocks/Walther p22/HKp30/SD9VE 9mm Material: High Quality Polymer Type: 7/8" 20mm Picatinny/Weaver Upper with 7 slots ,other with 3 slots Finish: Matte black Finish